Hey there. Weird issue just happened, I'm wondering if anyone can help.
I created an upgraded enchanting table and surrounded it with books. I clicked on it to open the GUI, placed my armour in the slot and started playing around. I did NOT apply an enchant.
I hit the escape button to do something else and then came back to the table. My armour is still missing, but when I click on the upgraded enchanting table, nothing happens. It's a non-interactive block now.